Is there a way to delete unneeded keyframes automatically with v2.79?
Now to achieve the same result, while hovering the dope sheet or the graph editor press 'X'.
From there you'll have the possibility to use the 'clean keyframes' option or 'clean channels'.



If you want to access it through the menu, just click the 'key' option and from there you can access the 'clean keyframes' (as shown above).